Republican presidential front-runner Donald Trump just landed a big endorsement ahead of Super Tuesday. Alabama Sen. Jeff Sessions, one of the Senate’s most hard-line figures on immigration, announced his support Sunday for Trump at a rally in Madison, Ala.

“We need to make America great again,” Sessions told a cheering crowd at a packed stadium in northern Alabama. “I am pleased to endorse Donald Trump for the presidency of the United States. I believe a movement is afoot that must not fade away. It has the potential to have the American people's voices heard."

Sessions' endorsement gives Trump a boost before Super Tuesday when Alabama and 10 other states, many of them in the South, stage nominating contests. It’s also a setback for Texas Sen. Ted Cruz, who has invoked the Alabama senator’s name during Republican debates as proof that he has stood firm on immigration.

There had been signs that Sessions was likely to support Trump, who has made halting illegal immigration a centerpiece of his campaign. Last month, a key Sessions aide, Stephen Miller, joined Trump’s campaign as a senior policy adviser, The Washington Post reported.

Sessions was one of Congress' most vocal opponents of a proposed immigration overhaul that passed the Senate in 2013. The bill would have allowed 11 million unauthorized immigrants to eventually become U.S. citizens. Sessions argued the measure provided "immediate amnesty before security." The plan never gained traction in the House.

"You have asked for 30 years and politicians have promised for 30 years to fix illegal immigration. Have they done it?" Sessions asked Trump's supporters Sunday.

"No!" the crowd roared back.

"Donald Trump will do it," Session said to cheers and chants of "We want Trump. We want Trump."